Manufacturing durable incandescent bodies.



Unrrnn drains a'rn'r Price.

ALBERT KOCH, OF BERNAU, GERMANY,- ASSIGNOR TO OHEMISOI-IE FABRIK VON MAXJASPER, OF SAME PLACE.

MANUFACTURING DURABLE lNCANDESCENT BODIES.

SPECIFICATION forming part-of Letters Patent No. 634,984, dated October17, 1899.

Application filed December 31, 1897- To all whom it may concern.-

Be it known that I, ALBERT KOCH, a subject of the King of Wiirtemberg,residing at Ber-nan, in the Kingdom of Prussia, Germany,

have invented new and usefulImprovements in the Manufacture of DurableIncandescent Bodies of which the following is a specifica tion.

This invention relates to a new process for manufacturing very durableincandescent bodies, such as mantles, and it is characterized by theimpregnation of any kind of in candescent bodies in an ashed andnot-ashed condition with alcoholic and volatile solutions or mixtures ofsuch organic silicium compounds which when burned form a residue ofsilicic acid (dioxid of silicon) and produce thus in a purely chemicalWay a strong skeleton containing as a main substance silicic 2o acid.

with the ashed or not-ashed incandescent body or mantles. It isonlynecessary that it is ignited immediately after the impregnation-thatis to say, in a wet condition and exposed to glowing heat. The silicicacid set free by the inflammation of the organic silicium compoundsadherent to the incandescent bodies combines in the glowing heat withone or more constituents of the ash, so 0 as to form an elastic and veryresisting material. The impregnation of already-ashed incandescentbodies may be carried out several times, so that finally acompletely-hardash skeleton is formed; but hitherto a single 5impregnation or incorporation of the silicic acid has been found inpractice completely sufficient, even when the incandescent body appliedto the burner was exposed to the greatest commotions imaginable.

As concerns the silicium compounds fit for the impregnation process, Iremark that all organic silicium compounds may be used (in first-lineesters and alkyls) which are combustible and form in burning dioxid ofsilicium. For practical and economical reasons silicium alkyls are, onaccount of their, for

This impregnation may be carried outselial No. 65,173. (No specimens.)

the most part, complicated and expensive manufacture, not so suitable assilicium esters, which I produce by the action of chloroform of silicium(siHOl on alcohol and also by treating alcohols (methyl, ethyl, amyl,&c.) with chlorid of silicium (SiOl For instance, the treatment of anincandescent body already ashed which has proved particularly rationalmay be carried out as 1301- lows: The ordinary incandescent body isburned in the usualway, somewhat shaped by means of pressed gas, andforms thus the known very fragile ashed incandescent body. This body isthen fixed to a hook and en tirely dipped into a cylindricalsufficiently large vessel containing a mixture, say, of amylic ether ofsilicium with amyl alcohol. After a short space of time the body iswithdrawn, ignited at once, and glowed. The impregnation is carried outexactly in the same manner with the other organic silicium compounds inquestion. I

Owing to the whole moistening above described of the incandescent bodywith the silicium compound the silicic acid produced by burning isuniformly distributed through the whole ash-body and by a short butstrong glowing the new durable body is produced.

I claim- 7 The process substantially as herein'before described ofmanufacturing (durable incandescent bodies, Whichconsists inimpregnating the incandescent bodies with alcoholic and ethericsolutions of organic silicium compounds, and exposing said impregnatedbodies to a glowing heat, setting free silicic acid (dioxid of silicium)which combines therewith to form an elastic and resisting body.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ALBERT KOCH.

Witnesses: I

OTTO HERING, MAX JASPER.

